FRANK C. GATES 
fire damage. Three atmometers were run in close proximity to small 
pine seedlings, two of which, No, 22 and No. 23, were under a fairly 
dense aspen stand, while No. 16 was exposed to the sky. 
Fig. 6. Floor of a hardwood or beech-maple forest showing atmometer No. 1 1 
in a dense mass of Acer saccharum seedlings. Seedlings of Acer pennsylvanicum are 
also present. July 22, 1915. 
Until the winter of 1911-12, south of Bryant's hotel, there was 
a patch of hardwood. East of it was pineland, now vegetated with a 
very open growth of aspen. A north and south ravine sharply separ- 
ated these two areas of different vegetation. As the area to the east 
is in line with the prevailing westerly winds, it has had abundant 
opportunity to become thoroughly seeded with Acer saccharum and 
other hardwood plants. The hardwood was cut in the winter of 191 1- 
12 and fireswept in May, 1915. To determine whether there was any 
particular characteristic of evaporation which possibly could have 
influenced the fact that Acer seedlings were not present in the pineland, 
although present on the hardwood land, two atmometers were run — 
No. 13 in the burnt-over hardwood land and No. 15 about 200 meters 
distant in the pine land. 
The evaporation conditions attendant upon the establishment of 
Thuja seedlings in boggy soil were investigated with 16 atmometers in 
1 9 16. Seed trees of Thuja are smaller, less abundant, and more local- 
